I think its "advanced brightness". Do you use ASUI? If so, you can add a command button to toggle apps between normal and maximized. Scroll to "Toggle Fullscreen button" at http://asui.garage.maemo.org/buttons.html#commands. You create the command in asui-settings, then use edit buttons or edit widgets inside ASUI to show the command button and place it somewhere on the first page, unless you want to swipe to the second page to use.

Edit: I think the menu was opening from the applet to the left of advanced brightness, no idea what that one is.

Try changing the ":ACTIVE:" to "whatever text is in the titlebar". It is case-sensitive and needs to be exact, and don't include the two colons that are around ACTIVE. It may be that open office is some how not the active window. If that works, you can remove the sleep from the command.

Edit: You can also replace ":ACTIVE:" with ":SELECT:" and tap on the window after running the command.